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| Item No. | MOHS Scale | Hardness | Rock Type | Color |
| Herac 1 | 1 | Soft | Clay, Siltestone |
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| Herac 2 | 1.5 | Soft | Coal, Vocanics |
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| Herac 3 | 2 | Soft | Rock Salt |
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| Herac 4 | 2.5 | Medium | Limestone, hard shale |
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| Herac 5 | 3 | Medium | Kimberlite |
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| Herac 6 | 3.5 | Medium | Marble, Dolomite |
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| Herac 7 | 4 | Medium Hard | Slate |
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| Herac 8 | 4.5 | Medium Hard | Sandstone,Andersite |
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| Herac 9 | 5 | Medium Hard | Limonite,Pegmatite |
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| Herac 10 | 5.5 | Medium Hard | Granite, Balsalt |
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| Herac 11 | 6 | Medium Hard | Diorite |
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| Herac 12 | 6.5 | Medium Hard | Quartz Porphyry |
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| Herac 13 | 7 | Hard | Crystauize Genesis |
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| Herac 14 | 7.5 | Hard | Chert |
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| Herac 15 | 8 | Hard Plus | Silicious Stone |
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| Herac 16 | 8.5 | Ultra Hard | Iron Stone,Jaspilite |
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| Herac 17 | 9 | Ultra Hard | Sapphire |
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